State two ways to prevent the rusting of iron.
Define the following terms.
$(i)$ Mineral $(ii)$ Ore $(iii)$ Gangue
You must have seen tarnished copper vessels being cleaned with lemon or tamarind juice. Explain why these sour substances are effective in cleaning the vessels.
In the electrolytic refining of a metal $M$, what would you take as the anode, the cathode and the electrolyte ?
What are amphoteric oxides? Give two examples of amphoteric oxides.